Over the last years, the interaction of international investment law and international and domestic tax measures has gained increased attention. According to UNCTAD data, tax issues have already played a role in approximately 15 percent of all known investment disputes. Especially, the 2020 awards in Vodafone v. India and Cairn Energy v. India have fuelled a debate on the role of investment arbitration in the resolution of tax-related disputes.
On the policy level, this debate comes at a time of significant reforms of the international tax systems. Noteworthy developments include the global corporate minimum tax initiative endorsed in November 2021 by the G20 and the OECD/G20 Inclusive Framework for the implementation of the Base Erosion and Profit Shifting (BEPS) Project, which aim at tackling tax avoidance, improving the coherence of international tax rules and ensuring a more transparent tax environment. Implementing these initiatives will also have to consider their relationship with other frameworks of international economic governance, specifically international investment treaties.
Several investment treaties include provisions that refer to tax-related issues. Commonly, carve-out clauses in various treaties filter out of the jurisdiction of an investment tribunal the State’s sovereign power to tax. But more sophisticated provisions are found, for instance, in the Energy Charter Treaty’s Article 21 or in Article 11 of the 2021 Canadian Model FIPA. Despite the tendency to include tax carve outs in investment treaties, there seems to be limited detailed discussion on the rationale for a complete removal of taxation measures from an investment tribunal’s jurisdiction.
The vast majority of investment treaties currently in force, in any event, lack a general tax carve-out. As in Cairn Energy v. India, tax issues are frequently at the core of arguments submitted by the parties. There, the tribunal held that retroactive taxation violated fair and equitable treatment. Additional questions have been raised, for instance, in First Majestic v. Mexico, where an arbitration has been initiated to enforce obligations under a double taxation treaty. There, the Claimants allege that Mexico failed to properly engage in the tax treaty dispute settlement under the mutual agreement procedure.
Finally, tax issues may also arise in post-award matters. This can be the case, even in investment arbitrations that otherwise lack a tax law angle, when the tribunal’s award may be subject to taxes that might prevent achieving the goal of granting full compensation for the damages caused by the acts and treaty violations of the State.
This panel will address relevant policy questions, as well as practical aspects on the increased importance of tax matters in investment arbitration. It will feature a dialogue between tax and investment law practitioners, and academics that will shed light on the interaction between those two regimes.